AC live and neutral wire problems

shaorc

AC live and neutral wire problems [Copy link]

 

[Ask if you don't understand] I suddenly remembered, why do the ordinary single-phase three-hole sockets on the wall have to be distinguished between the left neutral wire and the right live wire? Since the live wire and the neutral wire of AC power change once every 0.02 seconds, why do we need to distinguish between the live wire and the neutral wire?

maychang

At the distribution transformer (0.4kV system), the neutral line is connected to the ground. Therefore, at the user end, the voltage between the neutral line and the ground is very small (only the voltage drop on the neutral line).

maychang

Of course, if your device (such as an oscilloscope) is connected to the AC power supply through a 1:1 isolation transformer, then the two wires on the secondary side of the transformer are not divided into neutral and live wires and can be swapped at will.

曹伟1993

I have also thought about this question. Since the socket has a neutral wire and a live wire, should the plugs on my electrical appliances also be differentiated?

chunyang

Cao Wei 1993 posted on 2018-2-8 11:11 I also think about this question. Since the socket has a distinction between the neutral wire and the live wire, should the plugs on my electrical appliances also be distinguished?

Where distinction is required, directional plugs will be used, such as the common three-pin power plug. Where distinction is not required, non-directional plugs will be used, such as the common two-pin power plug. Whether distinction is required depends on the specific circuit/equipment.

PowerAnts

Why is it agreed that left is zero and right is fire? This is the result of ergonomics and electric shock statistics. 1. Most people are used to using their right hands. 2. The thumb is very capable. When plugging and unplugging plugs, the thumb is most likely to come into contact with the metal sheet. 3. Statistically, when the thumb of the right hand touches the metal sheet to plug and unplug the plug, the probability of left is zero and right is fire is the highest.

bobde163

PowerAnts posted on 2018-2-8 13:01 Why is it agreed that left is zero and right is fire? This is the result of ergonomics and electric shock statistics. 1. Most people are used to using their right hand; 2. The thumb is too capable, plugging and unplugging...

There is such a saying about the distinction between left and right, I learned something new

yet

PowerAnts posted on 2018-2-8 13:01 Why do we have the convention of left zero and right fire? This is the result of ergonomics and electric shock statistics. 1. Most people are used to using their right hands. 2. The thumb is too capable. It can plug and unplug...

Did Faraday's teacher say that? Or did the ants think of it

PowerAnts

yet Published on 2018-2-8 19:49 Did Faraday's teacher say that? Or did the ants think that?

Stupid people generally don't know how to summarize, and they won't believe others' summaries.

fangsir

Regarding the second question of the original poster, I think the main reason is that the power generation end is mostly three-phase electricity, and civilian use usually only uses one phase. At the power generation end, these three phases are usually connected together at one point and then connected to the earth. The power transmission process is mostly three-phase transmission, three wires, at a substation close to your home, one wire (neutral wire) is drawn from the earth, and one of the three wires (live wire) is then introduced into your home.

yet

PowerAnts posted on 2018-2-9 13:16 Idiots generally don’t know how to organize and summarize, and they won’t believe others’ summaries

You are already quite old, and have been on hundreds of forums, but you are still talking like you did when you were at your second aunt’s house, with your mouth full of words. Is it time to curse people next?

DIAG

The neutral wire (connected to the earth at the power transformer) and the ground wire (in rural areas, you need to hammer a grounding terminal by yourself, and buildings have unified grounding terminals) are both connected to the earth, but their functions are different; the sockets at home were originally connected randomly and there was no ground wire! With the renovation, they are all connected according to the left neutral, right live, and the middle ground, which is safe for people and electrical appliances!

PowerAnts

yet Published on 2018-2-9 16:36 I see that you are already quite old, and have been to hundreds of forums. But you are still making the same old mistakes as when you were at your second aunt’s house, and you speak without restraint. Should you curse people next...

If you want to cause trouble, I will curse you. What do you want to do?

yet

PowerAnts posted on 2018-2-9 21:38 If you want to cause trouble, I will scold you. What do you want to do?

Scolding people is stupid. I saw you scolding people a few years ago. You still have bad habits. This is the character of an ant!

hk6108

The neutral wire is the neutral wire in the three-phase (Y-shaped connection) four-wire system.

PowerAnts

yet Published on 2018-2-9 22:40 Scolding people is stupid. I saw you scolding people a few years ago. Bad habits have not changed. This is the character of ants!

I also dig up things on the Internet. What I dig up is knowledge, and the capital to scold people anywhere. I have already started to make dirty jokes and scold people in the office in my new company. The boss, the general manager, and the vice presidents all know my academic qualifications. , what did you dig up?

maychang

fangsir posted on 2018-2-9 13:44 Regarding the second question of the original poster, I think the main reason is that the power generation end is mostly three-phase electricity, and civilian use usually only uses one phase. At the power generation end, these three phases usually have a little...

"The power transmission process is mostly three-phase transmission, three wires, at the substation closer to your home, a wire (neutral wire) is drawn from the ground, and one of the three wires (live wire) is then introduced into your home." It should be said that the low-voltage side of the distribution transformer is connected in star connection, the neutral point is the neutral wire, and it is also connected to the ground.

PowerAnts

Regarding character, I will teach you another lesson: character has nothing to do with personality. There are many people with sharp tongues who are kind-hearted. There are many hypocrites among people with gentle manners. If you don't believe me, go home and ask your father and your father's father.

PowerAnts

Take the silly post in the 14th post for example (silly post is not insulting, it is a name he accepts). Every time he quarrels with me, every time he posts to get the other side to block my ID, he calls me a few days later to ask this and that, and ask me to do this and that. At first, I thought it was no use and responded to him, but later I just ignored him. May I ask, of the two people involved, who has better character and who has worse character? As soon as the word character comes out, it seems that I can be superior to others, haha, this word is very good. . .

PowerAnts

I am always willing to answer questions online or on the phone, even if they are just the last person to have an argument.